Description
Technical Parameters
Products Description
A through-hole type common mode choke (also called DIP / plug-in common mode choke, toroidal common mode choke coil) is a magnetic EMI filter component used to suppress common-mode electromagnetic interference (EMI) on power lines or signal lines. Two windings wound on the same toroidal core present high impedance to common-mode noise and filter it out, while offering almost no obstruction to the normal differential working current. It is a core component of the input EMI filter in switching power supplies.
Common names: Through-hole Common Mode Choke / Common Mode Choke Coil / Toroidal Common Mode Inductor (vertical or horizontal mounting style).
Construction
Core: toroidal core (Mn-Zn / Ni-Zn ferrite for common frequency ranges; nanocrystalline core optional when stronger low-frequency attenuation is required)
Windings: two electrically independent windings with identical turn counts, wound symmetrically on the same core
Working Principle (simplified)
Under normal operation, the currents on the line (L) and neutral (N) flow in opposite directions, so the magnetic flux produced by the two windings cancels out → the choke presents low impedance to the differential signal and causes almost no loss to normal power transmission.
When common-mode noise occurs (high-frequency interference currents flowing in the same direction on both lines, whether from external sources or the circuit itself), the flux of the two windings adds up → the choke presents high impedance and reflects/suppresses the noise energy.
That is why it is called a "choke": it deliberately chokes off common-mode interference current.
Hot Tags: Through-hole Type Common Mode Choke, China, manufacturer, supplier, factory, wholesale, price, for sale, electronic components, passive components, customer-made, standard
Send Inquiry
